There is a new 3D option for uses of Ordnance Survey mapping. This blog post describes how it is made.
You can get a 7 day free trial, and I've taken one out so that I can check out the mapping.
Here's Sgurr nan Gillean and the nearby peaks of the Cuillin taken from above the Sligachan Hotel. I climbed these peaks some years ago now...
Image copyright: Ordnance Survey